Bernette Chicago 7 - Page 126

124
Trouble Shooting
Problem Cause Correction Reference
Seam puckering
• The upper thread tension is too tight. – Loosen the thread tension.
16
• The upper thread is not threaded cor-
rectly.
– Rethread the machine.
12
• The needle is too heavy for the fabric
being sewn.
– Choose a needle to suit the thread
and fabric.
19/20
• The stitch length is too long for the
fabric.
– Adust the stitch length.
30
• The presser foot pressure is not cor-
rectly adjusted.
– Adjust the presser foot pressure.
17
Patterns/
Designs
are
distorted
• The correct presser foot is not used. – Select the correct foot.
127-132
• The upper thread tension is too tight. – Loosen the thread tension.
16
The machine
jams
• Thread is caught in the hook. – Remove the upper thread and the
bobbin case, turn the handwheel
backwards and forwards by hand
and remove the thread remnants.
120/121
• The feed dog is packed with lint.
The machine is noisy
• Lint has collected on the hook or nee-
dle bar.
– Clean the hook and feed dog as
described.
120/121
• The needle is damaged. – Replace the needle.
15
• Slight humming sound coming from
internal motor.
– Remove the upper thread and the
bobbin case, turn the handwheel
backwards and forwards by hand
and remove the thread remnants.
120/121
• Thread is caught in the hook.
• The feed dog is packed with lint.
Uneven stitches,
uneven feed
• Poor quality thread. – Select a better quality thread.
19/20
• The bobbin case is threaded incor-
rectly.
– Remove the bobbin case, thread and
reinsert correctly.
11
• Fabric has been pulled. – Do not pull the fabric while sewing, let
it be fed by the machine.
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